1.The picture of Precision Alloy Ni29Co18 Uns K94610 (4J29) .
4J29(China); 29H, 29H-B, Techallony(Russia); Kovar, Rodar, Glasseal 29-17(United States); Nilo K, Telcaseal(Great Britain); KV-1, KV-2, KV-3(Japan); Dilver P0, Dilver P1(France); Vacon 12, Silvar 48(Germany).
4J29 expansion alloy, also known as Kovar alloy, is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expansion characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular controlled expansion alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product. You'll find Kovar in applications such as power tubes, microwave tubes, transistors, diodes, hybrid packages, and other kinds of scientific instruments.
Application:
The alloy is widely used as glass sealing for electronic vacuum devices, such as launching tube, oscillating tube, ignitron, magnetron, transistor, sealing plug, relay, leading wire of integrated circuit, chassis, shell, scaffold and so on.
Physical Constants:
Density:8.17g/cm³
Specific gravity (g/cm3): 8.36
Melting point(ºC): 1450
Melting heat(calorie/g): 64
Vapour pressure (μ M): 1× 10-6 (1000ºC)
Specific heat(calorie/g/ºC): 0.105 (0ºC)
0.155 (430ºC)
Heat conductivity(calorie/cm· Sec. · ºC): 0.0395 (30ºC)
0.0485(300ºC)
Curie temperature (ºC): 435
γ α Phase-transition temperature(ºC): Below -80
Electrical performance:
Resistivity (μ Ω -mm): 49 (25ºC
3. Main grades and properties
| Composition % | ||
| Fe Bar | ||
| Ni 28.5-29.5 | ||
| Mn ≤0.50 | ||
| Si ≤0.30 | ||
| Cu≤0.20 | ||
| Cr ≤0.20 | ||
| Mo≤0.20 | ||
| C<0.03 |
Size:
Hot-rolled bar: Φ 8~38mm
Cold-drawn bar: ≤ 50mm
Forging bar: Φ 38~350mm
Wire: Φ 0.1mm~18mm
Cold-rolled strip: 0.15~4× 200mm
Hot-rolled strip: 4~22× 200mm
Cold-rolled sheet: 0.5~4× 1000× 2000mm
Hot-rolled sheet: 4~22× 1000× 2000mm
| Varieties | Steel type Specifications mm | Precision alloy | Resistance Alloys for electrical heating | Super alloy | Welding wire | Corrosion resistant alloy | |
| Rods | hot rolling rods | Φ8~38mm | available | available | available | ||
| Cold-drawn rods | ≤50mm | available | available | available | |||
| Forged rods | Φ38~350mm | available | available | available | |||
| Wires | Round wires | Φ0.3~8mm | available | available | available | available | available |
| Non-circle wires | Negotiation | available | available | available | |||
| Strips | Cold rolling | 0.15~4×200mm | available | available | available | available | |
| Hot rolling | 4~22×200mm | available | available | available | available | ||
| Plates | Cold rolling | 0.5~4×1000×2000mm | available | available | available | ||
| Hot rolling | 4~22×1000×2000mm | available | available | available | |||
| tubes | Φ4~63×0.5~5mm | available | available | ||||
| Executive standard: GB, GJB, HB, YB, ASTM, AMSE, negotiation and so on. | |||||||
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Shanghai Chonray Precision Alloy Co.,Ltd. was founded in Shanghai in Year 2000 with two major business sectors. One sector is that we have a manufacturing base in shanghai, which is professsional in highly engineered as well as standard electric heating elements, and optimized electric heating element solutions for industrial furnaces. Based on 15 years experience in electric heating elements, we have provided products and solutions to many well-known companies all through
the world including Ipsen,Aichelin Induatrial Furances, IMPC, Bao Steel, Huisen, Faw-Volkwagen, ZPMC, China Guodian, Fuyao Group, MCC and so on.
The second sector is that we have another manufacturing base in Jiangsu Province specialized in research and production of high resistance alloys, high-temperature alloys, corrosion resistant alloys, precision alloys, and welding alloys. We provide the alloys in form of rods,plates,strips,tubes,wires and various precision castings of more than 1,000 specifications in accordance with international standards or national standards by forging, rolling, drawing, casting and other processing methods. Based on 23 years industry experience, the alloy factory in Jiangsu Province has become the biggest manufacturer among the local private companies in the special alloy industry , which enables us to establish long -term and strategic cooperation with many big companies abroad and at home.
Carrying ISO9001:2008 and ISO14001 Certificates , our company ensures the quality control with the help of advanced testing and analysis equipment to inspect product composition, structure,performance and defects. Chonray professional team is fully qualified to satisfy your sales, engineering and logistics requirements. We are well positioned to meet the world increaseing demands for different precision alloys as well as the electric heating elements for industrial furnaces . We are confident to offer high quality products at competitive pricing backed by years of industrial experience.
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Our advantages and services
a. Our advantage
We can provide high quality materials, excellent design, precise manufacturing,complete specifications, considerate and integrity serivices.
We can provide over 100 grades of special alloys with 1000+ specifications and all kinds of electric heating elements for industrial furnaces , including customized products.
We can provide a complete solution for you.
OEM service can be provided.
b. Technical services we can provide:
Product selection
Process optimization
New product development
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